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November 9, 2009 Monday 12:35 PM
Meyer 5th Fl. CCPP Lounge
Other CCPP
(ccpp)
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CCPP Brown Bag
Kyle Cranmer
NYU
Searching for exotic Higgs decays in the LEP data
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November 11, 2009 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
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Ina Sarcevic
University of Arizona
Probing Particle Physics with Cosmic Neutrinos
Interaction of cosmic rays with the microwave background radiation
provides ``guaranteed'' flux of cosmic neutrinos. In addition
protons accelerated in the astrophysical source interact with
ambient photons and protons producing the flux of neutrinos.
I will discuss how these cosmic neutrinos could be used to
probe particle physics. I will show that charm production gives
rise to neutrino flux from astrophysical sources with jets driven
by central engine, such as gamma ray bursts or supernovae with jets.
The neutrino flux from semi-leptonic decays of charmed mesons is
subject to much less hadronic and radiative cooling than the
conventional flux from pion and kaon decays and therefore has a
dominant contribution at higher energies, of relevance to future
ultrahigh energy neutrino experiments. I will briefly discuss how
cosmic neutrinos can be used as probes of supersymmetry and the
challenges in detecting charged staus produced in neutrino interactions.
I will illustrate how neutrinos can be used as signals of dark matter
annihilation in the core of the Earth or the Sun, or in halos in the
universe.
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November 12, 2009 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
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Robert Austin
Princeton University
TBA
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November 13, 2009 Friday 2:00 PM
Meyer 6th Floor SCM Area
Hard Condensed Matter Seminars
(hcmp)
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Ian Appelbaum
Univresity of Maryland, College Park
Spin-Polarized Electron Transport and Electrostatic Gating in Silicon
Silicon, the materials basis for most semiconductor electronics devices, has been known for
decades to have an extraordinarily long spin lifetime. Using unique spin-polarized hot-electron
injection and detection techniques [1], we have observed unprecedented spin coherence, and
extracted very long spin lifetimes of conduction electrons traveling over macroscopic distances
[2], even in the millimeter range [3]. In this talk, I will discuss our recent work on lateral spin
transport devices where a buried SiO2 native oxide serves as a gate dielectric to electrostatically
control the proximity of spin-polarized conduction electrons to the interface.[4] Lattice inversion
symmetry breaking, and/or coupling to paramagnetic defects, drastically affects the spin lifetime,
as can be seen from time-of-flight distributions extracted from spin precession measurements.
Effects seen in high magnetic fields further elucidate the mechanisms relevant to electron spin
relaxation at this technologically important electronic interface.
[1] Ian Appelbaum, B.Q. Huang, and D.J. Monsma, "Electronic measurement and control of spin
transport in silicon," Nature 447, 295 (2007).
[2] B.Q. Huang, D.J. Monsma, and Ian Appelbaum, "Coherent spin transport through a 350-
micron-thick silicon wafer," Phys. Rev. Lett. 99, 177209 (2007).
[3] Biqin Huang, Hyuk-Jae Jang, and Ian Appelbaum, "Geometric dephasing-limited Hanle effect
in long-distance lateral silicon spin transport devices", Appl. Phys. Lett. 93, 162508 (2008).
[4] H.-J. Jang and Ian Appelbaum, “Spin polarized electron transport near the Si/SiO2 interface”,
Phys. Rev. Lett. 103, 117202 (2009).
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November 13, 2009 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
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Anze Slosar
Brookhaven National Lab
Probing primordial non-Gaussianity with today's universe
Primordial non-Gaussianity has been traditionaly constrained using three-point function of the cosmic microwave background. Two years ago, however, Dalal et al have shown that non-Gaussianity of the local type induces a scale dependent bias for biased tracers of the underlying dark matter structure. This allows constraining of the primordial non-Gaussianity from measurements of large-scale structure provided by redshift surveys. I will discuss the technique, its theoretical aspects and current results from the real data. I will also show some preliminary new results: extension to the two field inflationary models and the analogue of the Dalal effect in the Lyman alpha forest.
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November 17, 2009 Tuesday 3:30 PM
Meyer 611
Other Physics Department Events
(other)
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Alexander Jaoshvili
New York University
Oral Defense:
Experimental and Computational Analysis of Random Tetrahedral Packings with Applications
Committee:
Paul Chaikin (Thesis Advisor)
Aditi Mitra
Jun Zhang
Engelbert Schucking
Massimo Porrati
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November 18, 2009 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
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David Shih
IAS
TBA
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November 19, 2009 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
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Denton Ebel
American Museum of Natural History
Physical Processes in the Early Solar System: Evidence from Space Rocks
Physical processes active in the protoplanetary disk included gravitational instabilities (spiral waves), magnetorotational instabilities, meridional transport, vertical turbulent mixing, radiative transfer. Some temporal and spatial combination of such processes drove stellar accretion and planet formation in our (and other) solar system. Constraints on physical-chemical models are provided by the phenomenology of chondritic meteorites, interplanetary dust particles, and cometary materials (rocks), coupled with observations of young stellar disks (light). This evidence, recent results, current conundrums, and the status of 3D magnetohydrodynamic models of protoplanetary disks will be discussed.
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November 20, 2009 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
Daniel Kasen
UC Santa Cruz
The Physics of Type Ia Supernovae as Cosmological Probes
Type Ia supernovae are a key element for precision cosmology
missions, but the degree to which they constrain dark energy
depends on how well we can calibrate them as reliable standardized
candles. It is therefore important to develop a firm theoretical
understanding of the physics of supernova light curves. I will
explain, using both simple physical arguments and detailed numerical
simulations, the origins of intrinsic luminosity variations in Type Ia
supernovae and the empirical relations used to calibrate them (e.g.,
the Phillips relation). These theoretical studies provide a means for
anticipating the potential systematic errors facing cosmology experiments,
and suggest ways of obtaining more precise measurements in the future.
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November 24, 2009 Tuesday 3:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
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Aleks Diamond-Stanic
University of Arizona
Isotropic Luminosity Indicators in a Complete AGN Sample
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December 2, 2009 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
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Shlomo Razamat
SUNY, Stony Brook
TBA
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December 2, 2009 Wednesday 4:00 PM
Meyer 6th Floor Conference Room
Soft Condensed Matter Seminars
(csmr)
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Hartmut Loewen
Heinrich-Heine-Universitat at Dusseldorf
Particle-resolved Instabilities in Colloidal Dispersions
Dispersions of colloidal particles are excellent
model systems of classical statistical mechanics in order to understand
the principles of self-organization processes.
Using an external field (e.g. electric
or magnetic field) the effective interaction between the colloidal
particles can be tailored and the system can be brought into
non-equilibrium in a controlled way. In this talk,
we shall discuss lane and band formation in oppositely
driven colloidal mixtures,
both in DC and AC driving fields. The experimental realization in colloids
and dusty plasmas is highlighted.
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December 3, 2009 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
James Carpenter
TBA
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December 4, 2009 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
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David Law
UCLA
Tidal Disruption in a Triaxial Milky Way Dark Matter Halo: A Revised Model for the Sgr dSph Galaxy
Observations of the lengthy stellar streams produced by the tidal destruction of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) can provide strong constraints on the distribution of mass within the Milky Way. However, previous work has yielded conflicting results: while the angular precession of the streams has been thought to indicate an oblate shape for the Galactic halo, the radial velocities of stars in these streams are only reproduced in prolate halo models. I demonstrate that both observational characteristics are naturally reproduced by orbits within a triaxial Milky Way dark matter halo similar to that expected from current CDM theory. I conclude by summarizing the properties of the revised Milky Way --- Sgr system and discuss the possibility of using the Sgr stream to constrain the dark sector equivalence principle.
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December 9, 2009 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
-
Erick Weinberg
Columbia University
TBA
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December 10, 2009 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Sal Torquato
Princeton University
TBA
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December 11, 2009 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
Jennifer Siegal-Gaskins
Ohio State
Using anisotropy to identify a dark matter signal in diffuse gamma-ray emission with Fermi
Dark matter annihilation in Galactic substructure will produce diffuse gamma-ray emission of remarkably constant intensity across the sky, making it difficult to disentangle this Galactic dark matter signal from the extragalactic gamma-ray background. Recent studies have considered the angular power spectrum of the diffuse emission from various extragalactic source classes and from Galactic dark matter. I'll discuss these results and show how the energy dependence of anisotropies in the total measured diffuse emission could be used to confidently identify a signal from dark matter in Fermi data. Finally, I'll present new results demonstrating that anisotropy analysis could significantly extend the sensitivity of current indirect dark matter searches.
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December 15, 2009 Tuesday 2:00 PM
Meyer 6th Floor SCM Area
Other Physics Department Events
(other)
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Physics Department Holiday Reception
RSVP to Lorelei DeMesa at 212-998-7711 or lorelei.demesa@nyu.edu
if you will be attending.
Light refreshments will be served.
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December 16, 2009 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
-
Christopher Herzog
Princeton University
TBA
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January 22, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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January 27, 2010 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
-
Gavin Salam
TBA
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January 29, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
Vincent Desjacques
Institute for Theoretical Physics, Zurich
TBA
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February 4, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Matias Zaldarriaga
IAS
TBA
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February 5, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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February 12, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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February 19, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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February 24, 2010 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
-
Alexander Turbiner
UNAM, Mexico
TBA
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February 25, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Jerry Gollub
Haverford College
TBA
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February 26, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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March 4, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Adam Burrows
Princeton University
TBA
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March 5, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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March 11, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Janet Conrad
MIT
TBA
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March 12, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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March 26, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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April 1, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Jennifer Lewis
University of Illinois at Urbana-Champaign
TBA
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April 2, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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April 7, 2010 Wednesday 2:00 PM
Meyer 5th Fl. CCPP Lounge
High Energy Physics Seminars
(hep)
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Samson Shatashvili
Trinity College Dublin
TBA
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April 8, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Meg Urry
Yale University
TBA
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April 9, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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April 16, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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April 22, 2010 Thursday 4:00 PM
Meyer 122
Physics Colloquia
(colloquia)
-
Alex Filippenko
UC Berkeley
TBA
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April 23, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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April 30, 2010 Friday 2:30 PM
Meyer 5th Fl. CCPP Lounge
Astrophysics and Relativity Seminars
(astro)
-
TBD TBD
TBD
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